WLAN Simulation - Transmitter Implementation

This document demonstrates WLAN transmitter simulation implementation. After configuring system parameters, the transmission data generation process begins with these detailed steps:

1. Generate random transmission bits (tx_bits) - In this initial stage, channel coding is not implemented. The MATLAB code typically uses randi() function to create random binary sequences.

2. Perform QAM mapping - This converts bit sequences into complex symbols using quadrature amplitude modulation. Implementation involves qammod() function with specified constellation order.

3. Insert pilot signals into OFDM symbols - Pilots are predefined reference signals inserted at specific subcarrier positions for channel estimation.

4. Add DC and guard subcarriers - These subcarriers enhance signal stability by providing buffer zones and preventing DC offset issues in the frequency domain.

5. Execute IFFT and add cyclic prefix - The ifft() function transforms frequency-domain signals to time-domain, while cyclic prefix insertion mitigates inter-symbol interference.

6. Apply overlap window processing - This spectral shaping technique improves signal quality by reducing out-of-band emissions using window functions like Hanning or Hamming.

7. Generate short preamble in time-domain - Short training sequences are created for packet detection and coarse synchronization.

8. Generate long preamble in time-domain - Long training sequences provide fine synchronization and channel estimation references.

9. Assemble preamble and data symbols into packets - This concatenation forms complete transmission frames with proper structure.

10. Perform upsampling to obtain Tx_signal_up - The resample() or interp() function increases sampling rate for channel transmission requirements.

11. Refer to the attached wlan_transmitter.m file for complete MATLAB implementation details including function calls and parameter configurations.

These steps complete the data transmission process for WLAN transmitter simulation, demonstrating key physical layer operations in wireless communication systems.